Rotary gas-engine valve.



W. E. EWART.

ROTARY GAS BIGINE VALVE. "APPLICATION FILED H325, 1909.

988,546. l Patented Fem, 1911.

' WWA/5565.5. /d y m.

s. u ZW" 4/7//5 Am/P/l/fl/ i UNITED STATES PATENT oEEioE.

4[o all whom it may concern:

WLLIAME. EWART, OF SEATTLE, WASHINGTON.

ROTARY eAsENGINE VALVE.

Be it known that I, WILLIAM E. Ewaia'r, a citizen of the United States, residing at Seattle, in the county of King and State of Washington, have invented a new and useful Rotary Gas-Engine Valve, of which the fol lowing is a clear and concise specification.

My invention vrelates to a rotary valve for gas engines which is perfectly lbalanced and the expansion and contraction of the valve as well as the air will not materially affect its operativeness.

The objects of my invention are to provide a. rotary valve for gas engines which will at all times remain tight undervarying thermo conditions; to provide a `perfectly balanced gas engine valve and to 'provide a wear takino'l up means for rotary gas engine valves.

il accomplish these as well as minor objects by the construction new preferred by me and illustrated inthe accompanying drawings in whichy Figure l is a .plan view of my device, Fig. 2 is a transverse section of the preferred form of my device; Fig. 3 is an elevation showing the application of my device; Fig. lis a transverse section showing the arrangement of the ports and valve, Figs. 5 and G are modifications showing the balancing means ofmy device.

' I have provided a valve chamber 1 having water cooled walls 2, thewater traveling between said walls 2 and tho' jacket wall 3 forming a water spare l therebetween. '.Ihe valve chamber is preferably provided with a tapering valve seat 5 contorming tofthe vgeneral periphery of the valve G which is substantially the shape -of a rustum of a cone, said Valve G is rigidly secured to the stem 7 whereby said val/vef'is rotated, said stem 7 preferably passing through the under wall 8 of the valve" chamberLand into the boss J wlierebvfsaid valve stem is guided. I have provided a spring 1() on the exterior of ther valve chamber which rests against saidf'b'oss 9 and against the washer /111 which v isprevented from longitudinally sliding on said valve stein by the pin 1-2 permitting said 4spindle 7 to yieldingly move longitudinally wlvoqby the valvewhen expanding more than the material in the seat therearound draws the spindls 7 farther into thevalve chamben -When thevalve cools relative io the Walls of .the valve seat, the valve stem will be withdrawn, to a degree from said Specification of Letters Patent. Application inea :Fenaary 25, 190e.

Patented Feb. '74, 1911.

serial No, 480,064.

Valve chamber` by said spring 10. Said spring 10 also takes' up the wear between the valve and the seat.

The valve spindle is preferably rigidly secured at the lower endthereof to the gear wheel 13 which meshes with the gear wheel 14 secured to the crank shaft 15 of the engine. The gear wheel lit being 92 the pitch diameter of the gear 13 revolves said valve once to every two revolutions of the crank. By referring to Fig. 4 it -will be seen ,that both the exhaust port 16 and intake port 17 are closed and that the port 18 of the valve G is disposed nearly opposite said intake port 1T the valve traveling in the direction of the arrow is at the point of compression relative to the piston head 19 which is at the eXtreme upper end of the stroke. It is obvious thatas the valve tavelsI but of the number ot revolutions of the crankshaft that 2i of a revolution ot' the valve will be accomplished inthe same period of time as a revolution of the crank shaft and that when said piston 19 is at. the lower end of the stroke from the,.-/'

port 1T. At this point .said exhaust port is closed simultaneously with theI opening of the intake port 17 to communicate with Said cylinder Q0 which port 17 begins to open at the end 4ot the stroke permitting a newl supply ot' gas to enter therethrough while the piston travels downwardly. It being ob-v vious that said exhaust port 1G and said intake port i7 `will be closed while the piston` again vtravels lo the top end of the cylinder and also during its downward travel during which time the explosion of the newly ad-. mitied gas is propelling the engine which is accomplished by said newly adn'iitted gases being ignited by the sparlfplug 21 which may be of any com-mon type now in usein internal combustion engines. The valve 6 is provided with upright stanchions 22 which rigidly.v secure the balancmgvhead 23 thereto, said balancing head 23 engages and travels within a similar shaped cylinder or chamber head 29 escapes into the atmosphere-through vhead 29 which communicateswith the valve ipressure in t substantially the same as in the valve chain- 24 and is prevented fromwasteful leaking' by the piston rines 25. lVhat leakage passes said rings is dis Imi-ged into the atmosphere through an aperture 26 provided in the top walls 27 of said chamber 1. f

In Fig. 5 I have shown a modification of my device in which said valve 28 performing the function of said .valve 6 is counterbalanced bythe head 29 which-is rigidly secured to astem 30. Said head 29 is provided with a peripheral surface 31 fitting the Walls 32 which act as a seat therefor, said peripheral surface is substantially of the same taper as said valve 28. Said valve 28 is partially counterbalaneed by pressure from said chamber 1 which is transmitted through the duct 33 acting on the undersur face of said valve in the chamber 34 and also by pressure applied to the undersurface of said head 29 which is maintained in a chamber 35 adjacent the under surface of said chamber 1 by means of a duct 3G thusthe ie chambers 34 and 35 is kept ber l which communicates therewith. Anali leakage escaping between the walls 32 andthe duct 37 which communicates with the chamber 38` on the upper side of said head 29.

In Fig. 6 I have shown a modification in Awhich I have provided an extension 391 formed integral with the valve 40 which performs the function of .said 4valve (i. l have provided a pressure chamber t() coi'n- `inunicatingwith the interior 4-2 of said valve 4:0 which communicates with thevalve 5 chamber, the pressure being' supplied to said l chamber 4:1 by means of the duct 42.

I donot Wish to be limited to the specific y construction herein set forth and illustrated i in the accompanying drawings but desire to l depart l.from such details as are within `the scope of the appended claims.

Having thus described my" invention what I claim as new and desire to secure by Let-y ters Patent is.: y

1. In a rotary gas engine valve', a piston operated crankshaft, a tapered'valve rota tably driven by said crank shaft and yieldingly held in contact with the valve seat thereof whereby the wear and expansion and Acontraction of said valve are overcome preventing leakage aiid a balancing head hav-y ing substantially straight parallel sides connected to said tapered valve whereby the ex .pansion and contraction of the connection are permitted by' longitudinal movement of said balancing head. f

'2. In a valve for gasengines, a rotary valve tapering from a larger diameterat its one end to a smaller diameter at its opposite end, lia ving a portr communicating with the intake and exhaust ports to the engine, a

balancing lieadvto 4balance the pressure on the end of said rvalve and liaving'p'arallelV vone end to a smaller diameter at its opposite end, having. a port communicating with the intake and exhaust ports to the engine, a balancinghead, having parallel .sides perinitting longitudinal travel between. said i ta )ered valve andrsaid balancing head.

' ln testimony whereof I `have `signed my l name to this specification in the two subscribing witnesses.

Wl LLIA M E. lil WA RT.

presence of Witnesses;

Iiiir'mA. TALBOT, ,llcm E. lVumNu. 

